Move C# doc Github Action to Windows

[snnn]

Description

Move C# doc Github Action to Windows machines, to avoid having dependency on Mono which I think is getting deprecated.

Motivation and Context

[snnn]

/azp run ONNX Runtime React Native CI Pipeline, Linux GPU CI Pipeline, Linux CPU CI Pipeline,onnxruntime-binary-size-checks-ci-pipeline,Windows x64 QNN CI Pipeline,Windows GPU TensorRT CI Pipeline,Windows GPU Doc Gen CI Pipeline,Windows GPU DML CI Pipeline,Windows GPU CUDA CI Pipeline

[azure-pipelines[bot]]

Azure Pipelines successfully started running 9 pipeline(s).

[snnn]

/azp run Android CI Pipeline , Big Models , CoreML CI Pipeline , Linux Android Emulator QNN CI Pipeline, Linux Android Emulator QNN CI Pipeline,Linux CPU Minimal Build E2E CI Pipeline ,Linux GPU CI Pipeline

[azure-pipelines[bot]]

Azure Pipelines successfully started running 6 pipeline(s).

[snnn]

/azp run Linux GPU TensorRT CI Pipeline , Linux OpenVINO CI Pipeline ,Linux QNN CI Pipeline,MacOS CI Pipeline,ONNX Runtime Web CI Pipeline

[azure-pipelines[bot]]

Azure Pipelines successfully started running 5 pipeline(s).